STRUCT IRQ_AFFINITY_DESC(9)

✨ struct irq_affinity_desc(9) ✨

okay so welcome to the Kernel API Manual bestie, today we're learning about struct irq_affinity_desc — literally the Interrupt affinity descriptor 💅 it's giving "who gets to talk to which CPU" energy and honestly? iconic.

🌸 SYNOPSIS 🌸

struct irq_affinity_desc {
    struct cpumask  mask;
    unsigned int    is_managed : 1;
 };

look at her. two fields. no notes. 🎀

🦋 Members 🦋

• mask — this is a cpumask and it's the one holding the affinity assignment</> — like, the actual list of CPUs this interrupt is allowed to vibe with. main character field tbh 👑
• is_managed — a lil unsigned int bitfield sitting at : 1, and it's 1 if the interrupt is managed internally. that's it, that's the whole flag. one bit of pure attitude ✨

💖 SEE ALSO 💖

• Kernel file ./include/linux/interrupt.h struct irqaction(9)
• request_irq(9)
• struct irq_affinity_notify(9)
• struct irq_affinity(9)
• irq_update_affinity_hint(9)
• irq_set_affinity_and_hint(9)

all the siblings. the whole irq friend group fr fr 🫶 go read them next, iykyk.

ngl this page lives in ./include/linux and it's dated October 2026, and the page itself is titled struct irq_affinity_desc(9) — so like, if you're citing her, that's the whole receipt 💀

anyway that's the page!! interrupt affinity: understood, slayed, periodt 💅🌈⭐